Daylight Savings Time and the HMC
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What happens if you haven't updated your HMC by the time DST begins? Will there be an impact on the managed serves?
The HMC will not stop working, and neither will the managed servers. The time can be reset manually on the HMC. This will entail rebooting, but again, this has no impact on a running managed server. If the managed server's time has changed, but the HMC's has not, there will be no significant issues, either. Error messages posted on the HMC through Service Focal Point record the times on both the managed server and the HMC. Very few HMCs and managed servers are in sync time-wise, unless they are using Network Time Protocol. So the net effect is that you should not experience any problems if you have not set DST by applying the correct updates, based on the HMC code level you're running.